Description
In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to  a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb_regex_encoding().
Published: 2026-05-10
Score: 2.1 Low
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6255-1 php8.2 security update
Debian DSA Debian DSA DSA-6256-1 php8.4 security update
History

Tue, 12 May 2026 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Php
Php php
CPEs cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
Vendors & Products Php
Php php
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

Mon, 11 May 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Sun, 10 May 2026 06:15:00 +0000

Type Values Removed Values Added
First Time appeared Php Group
Php Group php
Vendors & Products Php Group
Php Group php

Sun, 10 May 2026 04:45:00 +0000

Type Values Removed Values Added
Description In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to  a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb_regex_encoding().
Title Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
Weaknesses CWE-476
References
Metrics cvssV4_0

{'score': 2.1, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/U:Amber'}

Subscriptions

Php Php
Php Group Php
cve-icon MITRE

Status: PUBLISHED

Assigner: php

Published:

Updated: 2026-05-11T13:13:50.416Z

Reserved: 2026-04-28T05:07:03.118Z

Link: CVE-2026-7259

cve-icon Vulnrichment

Updated: 2026-05-11T13:13:46.335Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-10T05:16:11.507

Modified: 2026-05-12T17:40:38.567

Link: CVE-2026-7259

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-10T06:00:05Z

Weaknesses